I know there is a place people used to call the "hot hole" that is over your direction where the water is warm year round due to a power plant using the lake as cooling water. The only problem is you genitals may fall off from the radiation. No big problem for me though since I don't seem to be able to keep a girlfriend very long.
I might be riding Port Sheldon tomorrow. It's about the end of my riding season though. Definitely dry suit weather. Have had great surf the last 4 weekends in a row. Let me know if you ever want to make the trek across the state for a little surf ride.
Chad